I don't see how this could be effectively implemented with the current icon information. As AWwrgwy stated, the key feature of the K-14 was to twist the throttle to get the proper sight ring around the target. With the range information currently in the icon, AND an adjustable sight ring, that would give you a sight like on a F-100, radar accurate range + lead computing (Not very realistic) for WW2 K-14.
So the only other option I can think of would be to add the K-14 (to the planes that had it in combat). Then add an analog control input, to make the ring bigger or smaller. Then remove the range info from the enemy icons (but only when you are in a K-14 equipped airplane).
I don't think many people would like the extra hassle, but who knows.